Question

what is the maximum heart rate for a 21 year old?
o 150
o 190
o 200
o 199

Explanation:

Step1: Use the formula

The common - used formula for estimating the maximum heart rate is $220 -$ age.

Step2: Calculate for a 21 - year - old

Substitute age = 21 into the formula: $220-21 = 199$.

Answer:

199